code: def create_and_test_config_to_json_string(self):
      config = self.config_class(**self.inputs_dict)
      obj = json.loads(config.to_json_string())
      for key, value in self.inputs_dict.items():
          self.parent.assertEqual(obj[key], value)
  
file_path: transformers/tests/test_configuration_common.py
imports: import copy
  import json
  import os
  import tempfile
  from transformers import is_torch_available
  from .test_configuration_utils import config_common_kwargs
label_desc: Use image node_id 3 for calling the ConfigTester obj's underlying member method code with example usage: obj.create_and_test_config_to_json_string() without return types